WO2001051284A2

WO2001051284A2 - Washing installation for printing press cylinders

Info

Publication number: WO2001051284A2
Application number: PCT/EP2001/000064
Authority: WO
Inventors: Torsten Schmutz
Original assignee: Baldwin Germany Gmbh
Priority date: 2000-01-08
Filing date: 2001-01-05
Publication date: 2001-07-19
Also published as: EP1244552B1; CN1392838A; DE10000554A1; DE50100438D1; US20030000407A1; JP2003523843A; EP1244552A2; WO2001051284A3

Abstract

The invention relates to a washing installation for printing press cylinders. Said washing installation comprises a free-wheel drive (22) of a dirty-cloth roller (12) which draws a section of a washing cloth from a clean-cloth roller (10) via a pressing element (18) onto the dirty-cloth roller (12) when a washing bar (4) that carries said components is returned from a washing position to a base position, thereby engaging a cloth transport lever (28) of the free-wheel drive with a first stop that is fastened to a holding device in which the washing bar (4) is guided. When the washing bar is inserted in the guides of the holding device, a lever arm (38) of the cloth transport lever (28) engages with a second stop that is provided on the holding device, thereby moving the cloth transport lever (28) past the first stop (26) without engaging with it and simultaneously effecting an advance of cloth from the clean-cloth roller (10) to the dirty-cloth roller (12).

Description

Washing machine for printing press cylinders

The invention relates to a washing system for printing press cylinders according to the preamble of claim 1.

Accordingly, the invention relates to a washing system for printing press cylinders comprising a washing bar which is movable transversely to the printing press cylinder in guides of a holder between a basic position which is a predetermined distance from the printing press cylinder to be washed and a washing position which is approximated to the printing press cylinder; bearings on the washing bar for a cleaning cloth spindle and for a dirt spindle for a washing cloth, a pressing element for pressing a washing cloth section against the lateral surface of the printing press cylinder on its way from the cleaning cloth spindle via the pressing element onto the dirty cloth spindle, and a freewheel drive for driving the dirty cloth spindle; a first stop on the bracket, by which a cloth transport lever of the freewheel drive is rotated in the drive direction, in that the first stop prevents the cloth transport lever from following the movement of the wash bar when the wash bar is moved back from the washing position into the basic position, whereas the cloth transport lever of the Freewheel drive automatically in The freewheeling direction turns when the wash bar is moved forward from the basic position to the washing position.

Wash bars are known from US 4344 361, which have a nozzle device for spraying water onto the wash cloth on its way from the cleaning cloth spindle to the pressing element. The washcloth is dry on the clean cloth spindle. It is also known to store a wash cloth moistened with detergent on the wet cloth spindle.

In known washing systems for printing press cylinders, the washing bar is inserted from top to bottom between the two-sided brackets of a machine frame and is then set into the basic position in an arcuate insertion movement from the top back to the front. This requires a relatively large amount of space for inserting the wash bar into the guides of the holder.

Before inserting the washing bar into the guides of the holder, a cloth roll is inserted into the washing bar on a cleaning cloth spindle and the beginning of the cloth is pulled over the pressing element to the dirty cloth spindle and fastened to the dirty cloth spindle. An attempt is made to stretch the washcloth between the cleaning cloth spindle and the dirty cloth spindle as best as possible, so that during the subsequent washing process the washcloth is stretched tightly over the pressing element. This stretching of the washcloth is often not done carefully enough. With a sagging washcloth there is a risk that it will be carried away by the printing press cylinder.

The cylinder to be cleaned in printing machines is, in particular, a blanket cylinder which, in the offset printing process, removes the printed image from transfers a plate cylinder to the printing medium or a paper web or a paper sheet. However, other cylinders of printing units of a printing press can also be washed with the washing bar.

The invention aims to solve the problem of designing the washing system for printing press cylinders in such a way that less space is required for inserting the washing bar into the guides of the holders, while at the same time ensuring that a clean washcloth section is automatically inserted when the washing bar is inserted into the holders the pressure element lies and the washcloth is optimally stretched between the cleaning cloth spindle and the dirty cloth spindle.

This object is achieved according to the invention by the characterizing features of claim 1.

Accordingly, a washing system for printing press cylinders is characterized in that the guides formed in the brackets extend in the direction from the washing position backwards beyond the basic position and that the washing bar moves in the same direction of movement as can be moved forward from the basic position to the washing position can be moved backwards and forwards in the guides from an insertion position into the basic position; that a second lever arm is rotatably connected to the cloth transport lever for common rotary movements at least in the drive direction of the freewheel, that the cloth transport lever and the second lever arm, transversely to the direction of the movements of the washing bar between its basic position and its washing position, protrude away from one another in opposite directions, that the First stop is arranged on the side of the dirty cloth spindle, on which the cloth transport lever protrudes, that a second stop on the holder on the side of the dirty cloth spindle facing away from one side is arranged, on which the second lever arm projects; that the second stop is so far offset from the first stop that the second lever arm rests on the second stop and thereby rotates the cloth transport lever in the drive direction so far that it is moved past the first stop without getting stuck when the washing bar from the insertion position is moved into the basic position, the second stop pushing the second lever arm away and releasing it at the latest when the washing bar reaches the basic position.

The invention has the following advantages in particular: The washing bar can be inserted from behind into the guides of the brackets on both sides and moved straight from the insertion position in the same direction to the basic position, in which direction the washing bar then also from the basic position to a washing position and back again is movable. This means that less work space is required to insert the wash bar into the brackets. The washcloth is automatically tensioned when the washbar is inserted into the holders, even if it could not be tightened manually when it was inserted into the washbar. If the washing bar is removed from the holders after several washing processes, then a washing cloth section soiled by the cleaned cylinder is located on the pressing element as a result of the previous washing process. When the washing bar is reinserted into the holders, the washing cloth is automatically advanced in the manner mentioned by the lever arm which is stuck at the second stop, so that a fresh washing cloth section automatically comes to rest over the pressing element.

Further features of the invention are contained in the subclaims. The invention is described below with reference to the drawings using a preferred embodiment as an example. The drawings show:

1 schematically shows a side view of a wash bar according to the invention,

Fig. 2 shows schematically the insertion position of the washing bar in a holder, a cloth transport lever of a freewheel drive of a dirty cloth spindle is shown in solid lines and broken lines the movement sequence of the cloth transport lever is shown, which takes place when the washing bar from the insertion position of Fig. 2 in the 5 is moved,

Fig. 3 shows the wash bar in a cloth transport position during the

Retraction movement of the wash bar from the insertion position of FIG. 2 towards the base position of FIG. 5,

4 schematically shows a further cloth transport position of the washing bar during the retracting movement from the insertion position of FIG. 2 to the basic position of FIG. 5,

5 shows the basic position of the washing bar, from which it can be moved forward into a washing position for washing a cylinder,

6 schematically shows a side view of the washing bar in the washing position for washing the cylinder,

7 schematically shows a top view of the washing bar in the holder in the insertion position of FIG. 2, 8 schematically shows a top view of the washing bar in the holder in the basic position of FIG. 5,

FIG. 9 schematically shows a top view of the washing bar in the holder in the washing position from FIG. 6.

The washing system according to the invention for washing a cylinder 2 shown in FIGS. 1 to 9 contains a washing bar 4, which is located in, preferably rectilinear, guide slots 6 of two stationary, parallel spaced-apart guide plates 8 between the basic position shown in FIG. 5 6, which is a predetermined distance away from the cylinder 2 to be washed, and the washing position shown in FIG. 6, which is approximated to the cylinder 2, can be moved back and forth at right angles to this cylinder by a drive, not shown, controlled by a press control, for example hydraulic cylinders or pneumatic cylinders.

The washing bar 4 has two side plates 9 arranged parallel and at a distance from one another for storing a clean cloth spindle 10 and a dirty cloth spindle 12 for a washing cloth 14. Furthermore, a pressing element 16 for pressing a washing cloth section 18 against the lateral surface 20 of the cylinder 2 is on the way of the washing cloth 14 from the cleaning cloth spindle 10 to the dirty cloth spindle 12 is provided. On the washing bar 4 there is a freewheel drive 22 for driving the dirty cloth spindle 12, for example clockwise according to arrows 24, in order to gradually transport the washing cloth 14 from the clean cloth spindle 10 via the pressing element 18 onto the dirty cloth spindle 12, such a transport step then being carried out each time. when the washing bar is moved back from the washing position of FIG. 6 to the basic position of FIG. 5. On one of the two stationary guide plates 8, which is opposite the freewheel drive 22 of the washing bar 4, a first stop 26 is formed, through which a cloth transport lever 28 of the freewheel drive 22 together with the dirty cloth spindle 12 in the drive direction, that is to say in the illustrated embodiment in a clockwise direction according to FIG Arrows 24 is rotated by the first stop 26 preventing the cloth transport lever 28 from following the movement of the washing bar 2 when the washing bar is moved back from the washing position of FIG. 6 to the basic position of FIG. 5 by the drive, not shown below the control device, also not shown. These are not shown because they are generally known.

However, when the washing bar is moved forward from the basic position of FIG. 5 to the washing position of FIG. 6, the cloth transport lever 28 is automatically rotated in the freewheeling direction, i. H. in the illustrated embodiment, counter to the arrows 24 in the counterclockwise direction. In this case, only the cloth transport lever 28 rotates, but not because of the freewheeling action of the freewheel drive 22, the dirty cloth spindle 12. This turning back of the cloth transport lever 22 in the freewheeling direction is preferably brought about by a spring integrated in the freewheel drive 22. According to another embodiment, however, a further stop on the stationary guide plates 8 could also be provided for this.

In the illustrated embodiment, it is assumed that in the washing position of FIG. 6, the pressing element 16 presses the washcloth section 18 on it against the lateral surface 20 of the cylinder 2 in order to clean it while the cylinder 2 is rotating and the washcloth 14 is stationary. According to another embodiment, however, the washcloth section 18 in the washing position of FIG. 6 could still be a small distance from the lateral surface 20 of the cylinder and by an additional movement of the pressing element 16 relative to the side plates 9 of the washing bar 4 are pressed against the cylinder 2. Such embodiments are known from the prior art and have, for example, an inflatable rubber lip as the pressing element 16.

Each of the two side plates 9 of the washing beam 4 carries two longitudinally arranged, laterally outwardly projecting roller bolts 30 and 31 (rollers mounted on bolts) which engage on one side of the washing beam 4 in one of the guide slots 6 of the fixed guide plates 8. The slots 6 are open at their rear end 32. As a result, the washing bar 4 with its roller bolts 30 and 31 can be inserted from behind into the rear slot ends 32 in the longitudinal direction of the slot and thereby brought into the insertion position of FIG. 2. The slots 6 can be open or closed at their front end facing the cylinder 2.

2 to 6, the wash bar 4 and the stationary guide plates 8 with the guide slots 6 are drawn one above the other in a side view in order to be able to better recognize the movement sequences of the wash bar 4 and its parts. The lateral assignment of the washing bar 4 between the stationary guide plates 8 can be seen from FIGS. 7, 8 and 9. The guide slots 6 extend in the guide plates 8 in the direction from the front washing position of FIG. 6 backwards beyond the basic position of FIG. 5, so that the washing bar 4 moves in the same direction as that from the basic position of FIG. 5 in 6 can be moved to the front, can be inserted from the back to the front into the guide slots 6 in the open rear slot end 32 thereof and can be inserted into the guide slots 6 in which both the front and the rear roller bolts 30 and 31 are in the guide slots 6 and keep the wash bar 4 free of tipping. A second lever arm 38 is non-rotatably connected to the cloth transport lever 28 for common rotary movements at least in the drive direction 24. The second lever arm 38 and the cloth transport lever 28 can be two parts or preferably consist together of a one-piece material part.

The cloth transport lever 28 and the second lever arm 38 project transversely to one another transversely to the direction of the movements of the washing bar 4 between its basic position of FIG. 5 and its washing position of FIG. 6, with the cloth transport lever 28 upwards and the second one in the illustrated embodiment Lever arm 38 protrudes downwards.

The first stop 26 is arranged on the side (upper side) of the dirty cloth spindle 12, on which the cloth transport lever 28 projects.

A second stop 40 is located on the guide plate 8, which is adjacent to the freewheel drive 22, on the side (lower side) of the dirty-cloth spindle 12 facing away from the one side (upper side), onto which the second lever arm 38 projects. Both stops 26 and 40 are arranged on the same guide plate 8 and both protrude inward towards the wash bar 4 from the latter.

The second stop 40 is offset far enough from the first stop 26 that the second lever arm 38 bears against the second stop 40 and thereby rotates the cloth transport lever 28 in the drive direction 24 so far that it is moved past the first stop 26 without getting caught, when the washing bar 4 is moved forward from the insertion position of FIG. 2 into the basic position of FIG. 5 in the guide slots 6. During these movements, the second stop 40 holds the second lever arm 38 in place, the second lever arm 38 running over the second stop 40 and from this second ar beat 40 is released at the latest when the wash bar 4 reaches the basic position of FIG. 5.

According to the preferred embodiment, the dimensions are selected such that the second lever arm 38 and thus also the cloth transport lever 28 is rotated by an angle of rotation in the drive direction 24, while it moves from the insertion position of FIG. 2 into the basic position of FIG 5 sticks to the second stop 40, which corresponds to a predetermined transport distance of the washcloth 14 around the pressing element 16, by which transport distance the washcloth is transported by the cloth transport lever 28 even if the washing bar 4 is from the washing position 4 with the smallest diameter of the dirty cloth roll on the dirty cloth spindle 12 of Fig. 6 is moved back to the basic position of Fig. 5.

If the angle of rotation of the cloth transport lever 28 in the drive direction 24 is the same each time the washing bar 4 is moved back from the washing position in FIG. 6 to the basic position in FIG. 5, then the feed path of the washing cloth 14 generated in this way is greater, the larger the Winding diameter of the wash cloth 14 on the dirty cloth spindle 12 is. So that this is not the case, but with each backward stroke of the washing bar 4 from the washing position of FIG. 6 to the basic position of FIG. 5, an equally large length of washing cloth of the washing cloth 4 is further transported around the pressing element 16, known measures are provided, which are therefore not described here be described individually in order to produce constant feed distances of the wash cloth 14 on the dirty cloth spindle 12 when the winding diameter of the wash cloth changes.

As in the prior art, the wash cloth 14 can already be pre-moistened on the cleaning cloth spindle 10, or spray nozzles or other liquid supply means may be provided to moisten the washcloth 14 on its path of movement from the cleaning cloth spindle 10 to the pressing element 16, as is known from the prior art.

Claims

claims

1. washing system for printing press cylinders containing a washing bar (4), which in guides (6) a holder (8) between a basic position (Fig. 5), which is a predetermined distance from the printing press cylinder to be washed, and a washing position (Fig. 6) which is approximated to the printing press cylinder, is movable transversely to the printing press cylinder; bearing on the washing bar for a cleaning cloth spindle (10) and for a dirt spindle (12) for a washing cloth (14), a pressing element (16) for pressing a washing cloth section (18) against the lateral surface of the printing press cylinder on its way from the cleaning cloth spindle over the Pressure element on the dirty cloth spindle, and a freewheel drive (22) for driving the dirty cloth spindle (12) are arranged; a first stop (26) on the holder (8), by means of which a cloth transport lever (28) of the freewheel drive (22) is rotated in the drive direction, the first stop preventing the cloth transport lever (28) from moving the washing bar (4) follow when the washing bar (4) is moved back from the washing position (Fig. 6) to the basic position (Fig. 5), whereas the cloth transport lever (28) of the freewheel drive (22) automatically rotates in the freewheeling direction when the Washing bar is moved forward from the basic position to the washing position; characterized in that the guides (6) formed in the brackets (8) extend in the direction from the washing position (Fig. 6) to the rear beyond the basic position (Fig. 5) and that the washing bar (4) moves in the same direction as it can be moved forward from the basic position into the washing position, can be moved from the insertion position (FIG. 2) into the basic position (FIG. 5) from the back to the front in the guides; that a second lever arm (38) is non-rotatably connected to the cloth transport lever for common rotary movements at least in the drive direction of the freewheel, that the first stop (26) is arranged on the side of the soiled cloth spindle on which the cloth transport lever (28) projects, that a second stop (40) on the holder (8) on the side of the soiled cloth spindle (12 ) is arranged, on which the second lever arm (38) projects; that the second stop (40) is so far behind the first stop (26) that the second lever arm (38) abuts the second stop (40) and thereby rotates the cloth transport lever (28) in the drive direction so that this is moved past the first stop (26) without getting stuck when the wash bar is moved from the insertion position into the basic position, the second stop (40) pushing the second lever arm (38) away and releasing it at the latest when the wash bar reaches the basic position.

2. Washing system for printing press cylinders according to claim 1, characterized in that the guides (6) are rectilinear.

3. Washing system for printing press cylinders according to claim 1 or 2, characterized in that the cloth transport lever (28) and the second lever arm (38) together are a one-piece material part.